The National Transportation Safety Committee (KNKT) conducted an investigation into the Trans Putera Fajar tourism bus accident carrying a group of students from SMK Lingga Kencana Depok on Jalan Raya Kampung Palasari, Ciater District, Subang Regency, West Java. KNKT chairman Soerjanto Tjahjono said his party had formed a team to investigate the cause of the bus accident that rolled over on Saturday at around 18.45 WIB. "Kami sesuai tugasnya dan tupoksinya menyidelidikan kecelakaan, mencari penyebab teknis dari kecelakaan ini untuk nantinya memberikan rekomendasi agar kecelakaan yang sama tidak berulang lagi," kata Soerjanto di Subang, Antara, Minggu, 12 Mei. Soerjanto explained that the focus of this investigation will further lead to the feasibility function on the bus, so that in the future there will be no more technical problems. "For technicalities, we will check why this vehicle technically experienced a failed brake," he said. According to him, his party is currently collecting data to witness statements to find out the factors that caused the accident which resulted in 11 deaths. "After the data is collected, we will investigate the bus problem, the possibility that what will be conveyed is the problem of overall system improvement," he said. Previously, the Head of the Traffic Corps (Kakorlantas) of the National Police Inspector General Pol. Aan Suhanan stated that the temporary results of the crime scene (TKP) did not find any traces of the brakes at the location of the overturned bus accident. "So if we look at the existing crime scene, there is no brake track from the bus. What is there is a tire mark, one part, it is suspected that it is right tire, there are several meters there. Then until the end of the incident point in front there it hit an electric pole," said Aan. According to him, the absence of traces of the overturned bus brakes must be investigated further. Apart from the failed brakes, there is a possibility that drivers will panic when the deadly event occurs.
"This is no brake track at all. It means, you need to investigate this. Why doesn't there be a brake track, whether the brakes don't work or the driver panics and so on," he said.

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